[Gluster-devel] Simplify creation and set-up of meta-volume (shared storage)

[Atin Mukherjee]

On 05/15/2015 07:30 PM, Avra Sengupta wrote:
> Hi,
> 
> A shared storage meta-volume is currently being used by
> snapshot-scheduler, geo-replication, and nfs-ganesha. In order to
> simplify the creation and set-up of the same, we are introducing a
> global volume set option(cluster.enable-shared-storage).
> 
> On enabling this option, the system analyzes the number of peers in the
> cluster, which are currently connected, and chooses three such
> peers(including the node the command is issued from). From these peers a
> volume(gluster_shared_storage) is created. Depending on the number of
> peers available the volume is either a replica 3 volume(if there are 3
> connected peers), a replica 2 volume(if there are 2 connected peers), or
> a single brick volume(if there is only one node in the cluster).
> "/var/run/gluster/ss_brick" serves as the brick path on each node for
> the shared storage volume. We also mount the shared storage at
> "/var/run/gluster/shared_storage" on all the nodes in the cluster as
> part of enabling this option.
> 
> Once the volume is created, and mounted the maintainance of the volume
> like adding-bricks, removing bricks etc., is expected to be the onus of
> the user.
> 
> On disabling the option, we provide the user a warning, and on
> affirmation from the user we stop the shared storage volume, and unmount
> it from all the nodes in the cluster.
> 
> These are achieved with hook-scripts as part of the volume set option.
> If anyone is interested in having a look at the patch, it's available
> for review at http://review.gluster.org/#/c/10793/ . If there is any
> feedback and suggestion regarding the same, please feel free to share it.
Didn't expect this patch coming so fast :) I will take a look at it in
some days.

~Atin
> 
> Regards,
> Avra
> 
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-- 
~Atin